Conducting Electronic Polymers by Non-Redox Processes
Abstract
Exhaustive extraction of the emeraldine base form of polyaniline (- (C6H4)-N-(C6H4)-N(H)-(C6H4)-N=(C6H4)=N-)x first by THF and then by NMP results in an approx 83% yield of analytically pure emeraldine base which upon protonic acid doping with HC1 gives a conductivity of approx. 18 S/cm. The NMP extract has a maximum molecular weight (g.p.c) of approx. 325,000. Crystalline fibers (approx 25 - 50 microm) of emeraldine base or emeraldine.HC1 can be formed by drawing fibers of emeraldine base in a water/NMP solution or in aqueous HC1 respectively. Scanning electron micrographs show they possess a clean, smooth, even surface. Conductivities in the range 30-80 S/cm are obtained for the emeraldine.HC1 fibers. Oriented polyaniline can be obtained by evaporating (in the presence of a heat lamp) a solution of emeraldine base (-(C6H4)-N(H)-(C6H4)- N(H)-(C6H4)-N=(C6H4)=N-)x in NMP on a polyethylene substrate while the substrate is being mechanically stretched. Small angle X ray data indicate anisotropy in the electron density both parallel and perpendicular to the stretching direction. The anisotropy disappears for distances less than about 5 nm. The orientation of fibril like structure is confirmed by scanning electron microscopy and is consistent with the result obtained on both emeraldine. HC1 by polarized infrared spectroscopy and polarized optical microscopy.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 30, 1988
- Accession Number
- ADA205554
Entities
People
- Alan G. Macdiarmid
Organizations
- University of Pennsylvania